<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title></title>
	</head>
	<body>
		
		<script>
			function test1(){
				console.log("test1函数被调用");
				test2();
			}
			
			function test2(){
				console.log("test2函数被调用");
				test3();
			}
			
			function test3(){
				console.log("test3函数被调用");
			}
			
			test1();
		</script>
	</body>
</html>
